Lawn-mower sharpener.



C. F. JUDSON.

LAWN MOWER SHARPENER. APPLICATION FlLED mac. Is, I914.

1,152,?36. PatentedSept; 7, 1915.

I 1I IIII WITNESSES INVENTOR COLUMBIA PLANOCIRAPH Cm. WASHINGTON. D. c.

cnEAnLEsr. JUDSON, cannons, IDAHO.

art

LAWN-MOWER snna'rnivnn.

To all whom it may concern: I j

Be it known that, I, CHARLES F. Jonson,

a citizen of the United States, and 1a resident ofEagle, in the county. of Ada and State of Idaho, have made certain new and useful Improvements Lawn-Mower Sharpeners, of which the following is a Specification.

My invention is an improvement in lawn mower. sharpeners and has for its object to provide a device of the character specified,

designed to be attached to the ordinary mower of the character specified, and having means for permitting the said device to be attached to anymower, regardless of the width of the cut, and having a plurality of 1 tively, of Fig.2.,

engaging surfaces and so arranged that either of the said surfaces may bebrought into action, and wherein the sharpening action takes place as the mower is run over the ground in the ordinary mannerof cutting the grass,

In the drawlng: Figure l 'is a top plan view of a lawn :mower, with the improved sharpener in place. Fig. 2 is alongitudinal section of the device, and Figs. Sand 4 are sections on the lines 3-3 and H respec- The', present embodiment of the invention isshowninconnection with a lawn mower of the ordinary type, having the axle 1, to

i which are, secured the wheels 2, and the handle 3 is connected to the wheels by means of the usual bracket arms 41, each arm havingjone end connectedto the handle and the other to thesupporting frame of the mower.

The cutting mechanism is ofthe usual form, comprising the blades 5 arranged substantially spiralwith respectto the shaft 1, the said'blades being spaced radially from a a common axisand spaced at regular angular intervals with respect to each other. The

- blades are connected to the hubs 6 in the orof the mower, in whichtheshaft 1 is jourl dinary manner, and are rotated by the movement ofthe wheel. -j

The sharpening device comprises a file 7 of square cross section, andhaving opposite faces formed to cut, as shown at 8. The file is connected with the supporting frame n'aled, by means of a; plurality of connecting devicesshown in Figs. 2 to 4. One of the said devices comprises a channel shaped link, the saidlinkhaving a body 9 and side Specification of Letters Patent. 7 Application filed December 18, 1914. Serial No. 877,896.

Patented Sept. '7, i915.

flanges 10, the said flanges being parallel and being spaced apart fromea'ch other a sufficient distance to receive the file 7 betweenthesame 1 e,

Each of the flanges at the end adjacent to the file is provided with an extension 11, and at the'said extension each of the flanges 10 of the link isprovided with an indentation on its outer, faces, the said indentation forming a boss 12 on theinner face of the arm. 1 4 I At the end adjacent to the link 9-10the file is provided withrecessesor depressions 13 on the faces of the file not provided with teeth,.and the said depressions .or recesses are adapted to be engagedby the bosses 12. The opposite end of the link 9- 10 is received, between the arms 14: of a U-shaped bracket, the bracket comprising abody 15 and the, arms 14;. .The body of the bracket is secured to the adjacent end of the supporting frame of the mower to which the wheels are connected, and the arms 14 of the bracketextend inwardly, as shown in F ig.,1. 1 A pin 16 is passed through the armsxand the flanges of the link,to pivotally connect the link to the bracket. The bracket 1 1-15 is spaced away from the blade and a coil spring 17 is arranged between the outer face ofthe file and the body 9 of the link, the said springbeing between the flanges 10 of the link, and thesaid spring acts normally to hold the fileiin the position shown in Fig. 2with respect to the link.

The opposite end of the file issupported by a similar mechanism,'but thelinkis sectional to provide for different sized mowers.

The said link ischannel shaped, consisting of sections 18 and 19 respectively. The section 18 is provided with the lateral flanges 20 extending parallel and in spaced relation,

and each of the said flanges is provided at the end adjacent to the filevwithan extension 21-, the said extensions engaging opposite faces of the file. Theother section;19

of the link is also provided with lateral The body 19 of the last named section of a the link is also outside of thebody .18 of the .firstnamed link, andeach of the flanges 22 of the last named section of the link is provided'with a longitudinally extending slot 23, The first named section 18 isprovided flanges 22, and the said flanges fit outside I the flanges 20 ofthe first named section.

with openingsregistering withfthe slot 23, and a bolt 2a is passed through the' regis ter ing opening and slot.

The bolt is provided'with a head 25, the said head engaging one flange 22, and a nut 26 is threaded on to the other end of the bolt,

the nut engagingthe other flange22 ofithe last named section. By loosening the nut mentioned, andthe file is provided-with 'recesses or'depressions for receiving the said bosses. The-recesses for receiving the boss 27 are precisely the same as those shown in Fig. 3 and are not more particularly shown for this reason. 1

Y The outer end of the'lastnamed section V of the sectional link-is'pivoted'to a substantially U-sha'ped bracket, the said bracket comprising a body 28 and arms 29. The

' body 28 of thebracket is secured tothe supporting frame connected tothe wheels,'in the same manner as is the body of the bracket 14 15,-and arms 29 on the bracket extend on oppositesides of the outer section of the link, as shown in Fig. 1, and a pivot pin 30'pivotally connects the outer section I 0f the linkto the said bracket arm.

A coil spring 31 is arrangedbetweenthe last described link and the adjacent face of thefile, thes ai'd spring engaging the outer face of the file at one end and the inner face of the body 18 of the innersection of the --link at the-other end and the said spring acts normally to hold the filein the position: of

Fig. 2, with respect to the link.

In" operation, the device is'arranged as 'shown in Fig. l,--w ith one of the-cutting faces of the file in such position that as'the cutting reel revolves the blades will; engage thesaid cutting face ofthe file with their cutting edges in su'ccessiomand thesaidcut- Y ting edges of the file willgrind away the blade at the properangle.

. The device may bel ft' o y 6 may bedetached and connected with another mower. The brackets-Heel?) and 28- 29 are permanently connected with the supporting frame of the mower. The

springs'l? "and 31 normally hold the cutting face of'the filein'enga'gement withthe cutting edges of the blade,:butthe springsinay yield to provide a yielding support for the file.

it may be turned to bring anotherflface into 'fjusted position; a U i 2. A sharpener for lawn mowers comprising a fileor bar of approximately rectangular cross section having alternate file or'cut 5 be used. The cutting faces of the file may be of any desired degree of coarseness or fineness, and the said file will be made of a length'to suit the'mower. While one of the supporting .links is sectional, it is obvious that the file'must be at least as long as the projection of the cutting blad'e,,otherwi se every part of the cutting edge" of the'blade could not'engagex'the. cutting face of the file.

The device is simple and 7 may be constructed at a very low cost. It is easily adjusted, and once adjusted, may beleft in position. After the blades have been sharpened to a suflicient extent, thefile maybe arms extending approximately parallel from the body, a link for connectingthe" arms of each bracket to the adj-acentend of the bar, each link beingofchannel shape and comprising a body and-flanges extendingllaterally from the body in the same direction, the

arms of each'bracket being pivoted tothe flanges 'Of'the adjacent linkat the outer end thereof,-and the-bar having a pair of oppositely arranged indentations on the plain faces thereofneareach end, the flanges of each link having bosses on 'their innerfaces -ror engaging the indentations, said bosses being at the inner end of the link, and a spring arrangedbetween the body of; each link 'andthebar, between thepivotal connections of the link and-the adjacent end of the bar, thef'springs normally holding the linksinclined with respect'to the bar, one of the'links being sectional, and "the sections being slidable with respect to eachother,

and means for securing the sections in adtingffaces, and means in connection with the file for connecting the file to a lawn" mower with the'long axis 'of-the file parallel with the'axis of rotation of' theblades of the "mower, i saidmeans 1 comprising 7 a pair of U-shaped brackets, each consi-stlng of body adapt-ed ffor connection {with the mower; and

j w i I L V I i I g u arms extending approximately parallel from When the file 'becomes worn on one face,

the body, a" link' forj "connecting "the. arms of e'achbracket to-the adj acentend of the bar, each link being of channel shape and comprising a b lody and f'fianges.extending laterally from the-Mayan the same direction, the

arms of each bracket being pivoted to the flanges of the adjacent link at the outerend thereof, and the bar having a pair of oppositely arranged indentations on the plain faces thereof neareach end, the flanges of each link having bosses on their inner faces for engaging the indentations, said bosses being at the inner end of thelink, and 'aspring arranged betweenthe body of each link and the bar, between the pivotal connections of the link and the adjacent end of the bar, the springs normally holding the links inclined with respect to the bar, one of the linksv being sectional, the sections being ads justable with respect to each other.

3. A sharpener for lawn mowers'comprising a file or bar of approximately rectangular cross section having alternate file or cutting faces, and means in connection with the file for connecting the file to a lawn mower with the long aXisof the file parallel with the axis of rotation of the blades of the mower, said means comprising a pair of U-shaped brackets, each consisting'ofa body adapted for connection with the mower, and arms extending approximately parallel from the body, a link for connecting the arms of each bracket to the adjacent end of the bar, each link being of channel shape and comprising a body and flanges extending later-' being at the inner end of the link, and a spring arranged between the body of each link and the bar, between the pivotal connec tions of the link and the adjacent end of the bar, the springs normally holding the links inclinedwith respect to the bar.

4. A sharpener for lawn mowers comprising a file orbar having cutting faces, a link pivoted to the bar near each end thereof and at the inner end of the link, a bracket pivoted to the outer end of each'link for attachment to the lawn mower frame, each link extending beyond the adjacent end of the bar,

and a spring arranged between each link and the bar normally holding the link inclined with respect to the bar, oneof the bars being sectional and the sections being adjustable with respect to each other.

CHARLES F. JUDSON.

Witnesses:

JAMES H. LoMn,

(humans 13. COKE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, .D. G. 

